linux-kernel - Re: [PATCH] arc: kernel: add default extern variable 'screen

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Message-ID: <526B252F.2050506@asianux.com>
Date:	Sat, 26 Oct 2013 10:13:03 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Arnd Bergmann <arnd@...db.de>,
	"sachin.kamat@...aro.org" <sachin.kamat@...aro.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	James Hogan <james.hogan@...tec.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH] arc: kernel: add default extern variable 'screen_info'
 in "setup.c"

On 10/24/2013 07:51 PM, Geert Uytterhoeven wrote:
> Hi Chen,
> 
> On Thu, Oct 24, 2013 at 1:23 PM, Chen Gang <gang.chen@...anux.com> wrote:
>>> Lot's of negative dependencies are missing for VGA_CONSOLE.
>>> I think only alpha, some arm, ia64, some mips, some powerpc, and x86
>>> may use it.
>>>
>>
>> in "arch" sub-directory, contents 13/30 (43.3%) architectures contents
>> VGA_CONSOLE.
>>
>>   1 alpha/kernel/setup.c:137:struct screen_info screen_info = {
>>   2 arm/kernel/setup.c:743:struct screen_info screen_info = {
>>   3 cris/kernel/setup.c:28:struct screen_info screen_info;
>>   4 ia64/kernel/setup.c:79:struct screen_info screen_info;
>>   5 m32r/kernel/setup.c:55:struct screen_info screen_info = {
>>   6 mips/kernel/setup.c:43:struct screen_info screen_info;
>>   7 powerpc/kernel/setup-common.c:88:struct screen_info screen_info = {
>>   8 score/kernel/setup.c:37:struct screen_info screen_info;
>>   9 sh/kernel/setup.c:68:struct screen_info screen_info;
>>  10 sparc/kernel/setup_64.c:66:struct screen_info screen_info = {
>>  11 sparc/kernel/setup_32.c:53:struct screen_info screen_info = {
>>  12 tile/kernel/setup.c:54:struct screen_info screen_info;
>>  13 x86/kernel/setup.c:220:struct screen_info screen_info;
>>  14 xtensa/kernel/setup.c:55:struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
>>
>> It seems most of pc and servers support VGA_CONSOLE.
> 
> I'm quite sure many of these just provide a screen_info to make vgacon compile.
> 

Thank you for your confirmation.

>>> Compare this to a shiny new feature that available on all new architectures,
>>> but not on a few old one. There it makes sense to have the negative
>>> dependencies on the old architectures, that will never have the new feature.
>>> While new architectures have enabled it by default.
>>>
>>
>> Excuse me, my English is not quite well, I do not quite understand your
>> meaning, but it seems not quite important for our discussing, so I just
>> skip it, now.
> 
> Sorry, I should stop writing complex sentences.
> For now, nevermind. There aren't that many real cases like this.
> 

And I should be still improving my English. :-)

> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> 
> 

Thanks.
-- 
Chen Gang
--
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